01 - Heat 1 tbsp vegetable oil in a large skillet or wok over medium-high heat. Add minced garlic and grated ginger, sauté for 30 seconds until fragrant.
02 - Add shredded cabbage, carrots, sliced mushrooms, and bell pepper to the hot pan. Stir-fry for 2-3 minutes until vegetables begin to soften.
03 - Incorporate bean sprouts and sliced green onions. Continue stir-frying for another minute to maintain crisp texture.
04 - Pour in soy sauce, oyster sauce, sesame oil, and white pepper. Cook for 1-2 minutes until vegetables are tender yet crisp. Transfer filling to a colander, let cool completely, and press gently to remove excess moisture.
05 - Position spring roll wrapper with one corner facing you. Place approximately 2 tbsp filling near the bottom corner. Fold bottom corner over filling, fold in sides, and roll tightly. Seal edge with flour-water paste. Repeat with remaining wrappers and filling.
06 - Heat 2 inches vegetable oil in deep skillet or pot to 350°F. Fry spring rolls in batches for 3-4 minutes, turning occasionally, until golden brown and crispy throughout.
07 - Remove spring rolls with slotted spoon and drain on paper towels. Serve immediately with sweet chili sauce or soy sauce for dipping.